VC、TiC对无粘结相碳化钨基硬质合金摩擦磨损性能影响的研究
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摘要
对不同VC、TiC含量的无金属粘结相WC基硬质合金的摩擦磨损性能进行研究。实验结果表明,随着VC、TiC含量的升高,硬质合金的平均摩擦系数和磨损率不断下降。VC、TiC摩尔含量均为5%时,磨损率最低,为4.6×10~(-5) mm~3/Nm,较未添加VC、TiC的硬质合金磨损率下降约98%。硬质合金的耐磨性与其硬度成正相关性,无或者低含量VC和TiC的硬质合金硬度较低,其磨损机理以粘着磨损和磨粒磨损为主,磨损率较高;高VC和TiC含量的硬质合金硬度较高,其磨损机理以晶粒的拔出和表面开裂为主,磨损率较低。
The friction and wear properties of binderless WC-based cemented carbide with different VC and TiC concentration were investigated.The experimental results show that the average friction coefficient and wear rate of cemented carbide decrease with the increase of VC and TiC content.The minimum wear rate of 4.6×10~(-5) mm~3/Nm is obtained when the mola concentration of VC and TiC are 5%,which is reduced by about 98% compares with that of cemented carbide without VC or TiC.The wear resistance of cemented carbide is positively correlated with its hardness.The hardness of cemented carbide without or with low content of VC and TiC is lower,and its wear mechanism is mainly adhesive wear and abrasive wear,and the wear rate is higher.The hardness of cemented carbide with high VC and TiC content is higher,and its wear mechanism is mainly grain pullout and surface cracking,and the wear rate is lower.
The friction and wear properties of binderless WC-based cemented carbide with different VC and TiC concentration were investigated.The experimental results show that the average friction coefficient and wear rate of cemented carbide decrease with the increase of VC and TiC content.The minimum wear rate of 4.6×10~(-5) mm~3/Nm is obtained when the mola concentration of VC and TiC are 5%,which is reduced by about 98% compares with that of cemented carbide without VC or TiC.The wear resistance of cemented carbide is positively correlated with its hardness.The hardness of cemented carbide without or with low content of VC and TiC is lower,and its wear mechanism is mainly adhesive wear and abrasive wear,and the wear rate is higher.The hardness of cemented carbide with high VC and TiC content is higher,and its wear mechanism is mainly grain pullout and surface cracking,and the wear rate is lower.
引文
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[2] KONYASHIN I,RIES B.Wear damage of cemented carbides with different combinations of WC mean grain size and Co content.Part I:ASTM wear tests[J].International Journal of Refractory Metals & Hard Materials,2014,46:12-19.
[3] 张辉,邓建新,李桂玉.晶粒尺寸对WC硬质合金刀具材料摩擦磨损性能的影响[J].工具技术,2010,44(6):9-12.
[4] ANGSERYD J,FROM A,WALLIN J A,et al.On a wear test for rock drill inserts[J].Wear,2013,301(1):109-115.
[5] 刘超.无粘结相硬质合金的发展及展望[J].中国材料进展,2016,35 (8):622-628.
[6] DENG J,ZHANG H,WU Z,et al.Friction and wear behaviors of WC/Co cemented carbide tool materials with different WC grain sizes at temperatures up to 600 ℃[J].International Journal of Refractory Metals & Hard Materials,2012,31(31):196-204.
[7] ESPINOSA L,BONACHE V,SALVADOR M D.Friction and wear behaviour of WC-Co-Cr3C2-VC cemented carbides obtained from nanocrystalline mixtures[J].Wear,2011,272(1):62-68.
[8] BONNY K,BAETS P D,PEREZ Y,et al.Friction and wear characteristics of WC-Co cemented carbides in dry reciprocating sliding contact[J].Wear,2010,268 (11-12):1 504-1 517.
[9] 李海艳,刘宁.VC对WC-6.5%Co硬质合金组织和性能的影响[J].硬质合金,2009,26(4):206-211.
[10] 张端锋,江垚,吝楠,等.WC-TiC-Ni硬质合金的制备与性能[J].粉末冶金材料科学与工程,2011,16(2):303-308.
[11] LIN N,HE Y,WU C,et al.Influence of TiC additions on the corrosion behaviour of WC-Co hardmetals in alkaline solution [J].International Journal of Refractory Metals & Hard Materials,2014,46(8):52-57.
[12] YE J W,CHEN S K,LIN,S J.Nanostructured high-entropy alloys with multiple principal elements:novel alloy design concepts and outcomes[J].Advanced Engineering Materials,2004,6(5):299-303.
[13] 李大梅,尤显卿,许育东.氧化铝基陶瓷材料断裂韧性的测量与评价[J].硬质合金,2004,21(4):231-236.
[14] RAY K K,DUTTA A K.Comparative study on indentation fracture toughness evaluations of soda-lime-silica glass[J].Advances in Applied Ceramics,1999.98(4):165-171.